My floor tunnel was butchered for some sort of shifter in it's earlier days. I have a donor 66' tunnel to repair this problem. Was wondering if you guys have a sure way to ensure I don't mess this up. The 65' is a 4spd car, and the 66' donor is an auto, I don't think there is a difference but if there is, now would be a good time to know it. Thanks again in advance for any info.